JMatch1D.hh

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#ifndef __JTRIGGER__JMATCH1D__
#define __JTRIGGER__JMATCH1D__

#include "JPhysics/JConstants.hh"

#include "JTrigger/JMatch.hh"


/**
 * \file
 *
 * Match operator for Cherenkov light from muon with given direction.
 * \author mdejong
 */
namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }

namespace JTRIGGER {

  using JPHYSICS::getInverseSpeedOfLight;
  using JPHYSICS::getIndexOfRefraction;
  using JPHYSICS::getTanThetaC;


  /** 
   * 1D match criterion. 
   * This match algorithm is intented for muon signals.
   * It is assumed that the muon direction is along the z-axis.
   */
  template<class JHit_t>
  class JMatch1D :
    public JClonable< JMatch<JHit_t>, JMatch1D<JHit_t> >
  {
  public:
    /**
     * Constructor.
     *
     * \param  roadWidth_m      maximal road width [m]
     * \param  Tmax_ns          maximal extra time [ns]
     */
    JMatch1D(const double roadWidth_m,
             const double Tmax_ns = 0.0) :
      RMax_m      (roadWidth_m),
      TMaxExtra_ns(Tmax_ns),
      x(0.0),
      y(0.0),
      z(0.0),
      d(0.0),
      t(0.0)
    {
      TMax_ns = 0.5 * RMax_m * getTanThetaC() * getInverseSpeedOfLight()  +  TMaxExtra_ns;
    }


    /**
     * Match operator.
     *
     * \param  first    hit
     * \param  second   hit
     * \return          match result
     */
    virtual bool operator()(const JHit_t& first, const JHit_t& second) const override 
    {
      z = first.getZ() - second.getZ();
      t = fabs(first.getT() - second.getT() - z * getInverseSpeedOfLight());

      if (t > TMax_ns) {
        return false;
      }

      x = first.getX() - second.getX();
      y = first.getY() - second.getY();
      d = sqrt(x*x + y*y);

      if      (d <= 0.5 * RMax_m)
        return t <=  d           * getTanThetaC() * getInverseSpeedOfLight()  +  TMaxExtra_ns;
      else if (d <= RMax_m)
        return t <= (RMax_m - d) * getTanThetaC() * getInverseSpeedOfLight()  +  TMaxExtra_ns;

      return false;
    }


    double RMax_m;
    double TMax_ns;
    double TMaxExtra_ns;

  private:
    mutable double x;
    mutable double y;
    mutable double z;
    mutable double d;
    mutable double t;
  };
}

#endif